Morphological and reproductive acclimations to growth of two charophyte species in shallow and deep water
Morphological and reproductive acclimations to growth of two charophyte species in shallow and deep water
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DOI：
10.1016/j.aquabot.2007.01.010
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发表时间：
2007-05-01
期刊：
影响因子：
1.8
通讯作者：
Sanderson, Brian
中科院分区：
文献类型：
--
作者：
Asaeda, Takashi;Rajapakse, Lalith;Sanderson, Brian
调查了两种轮藻的分布情况。fibrosa（A. Br.）和透明丽藻Nitella hyalina（DC.）Ag.，在Myall湖，浅湖在新南威尔士州，澳大利亚，试图阐明的因素，导致其分布格局。2003年7月至2005年5月进行了实地研究，轮藻与底质沉积物在20个采样点在湖泊中的13次采样。轮藻生物量（0-321 g DW m（-2））随深度的变化呈现最佳曲线，最大生物量出现在1 - 2.5 m深度之间。在更深的水中，枝条更长（即，在1 m深度处约30 cm，在2 m和4 m深度之间为60-90 cm）。卵孢子和精子器密度在浅水区较高，最大值在80 cm左右。植物生长在浅的深度有较短的节间，这意味着短的生命周期的芽，和节点的间距是相对规律的，相反，它的深水同行，虽然间距往往会增加在远离顶点的位置。本研究还报告说，有一个明显的下降，随着水深的增加，有性繁殖体的生产率，进一步突出了轮藻在浅水和深水的不同形态和生殖驯化。(c)2007 Elsevier B. V.保留所有权利。
We investigated the distribution of two charophyte species, Chara fibrosa var. fibrosa (A. Br.) and Nitella hyalina (DC.) Ag., in Myall Lake, a shallow lake in New South Wales, Australia, in an attempt to elucidate the factors causing their distribution patterns. The field study was carried out from July 2003 to May 2005 and charophytes were sampled together with bottom sediments at 20 sampling locations in the lake on 13 occasions. Charophyte biomass (0-321 g DW m(-2)) displayed an optimum curve with depth and maximum biomass occurred between 1 and 2.5 m depth. In deeper water, shoots were longer (i.e., around 30 cm at I m depth to 60-90 cm between 2 and 4 m depth). Oospore and antheridia densities were higher in shallower water with a maximum around 80 cm. Plants growing in shallow depths had shorter internodes implying a short life cycle of shoots, and nodal spacing was relatively regular in contrast to its deep water counterparts although spacing tended to increase at locations farther from the apex. The present study also reports that there is an apparent decline in sexual propagule production rates with increasing water depth, further highlighting the different morphological and reproductive acclimations of charophytes in shallow and deep water. (c) 2007 Elsevier B.V. All rights reserved.